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            <h1 id="ESP-IDF学习笔记-调试等级打印"><a href="#ESP-IDF学习笔记-调试等级打印" class="headerlink" title="ESP-IDF学习笔记-调试等级打印"></a>ESP-IDF学习笔记-调试等级打印</h1><p>ESP32IDF中提供了一个LOG库，根据不同调试等级打印信息，这里记录一下简单用法。</p>
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            <a class="article-title text-lg" href="/post/4129/">对带通采样定理的理解</a>
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            <h1 id="对带通采样定理的理解"><a href="#对带通采样定理的理解" class="headerlink" title="对带通采样定理的理解"></a>对带通采样定理的理解</h1><p>奈奎斯特采样定理要求采样频率必须大于信号频率的2倍，不然会发生频谱混叠。但是对于高频信号，ADC难以达到所需要的采样率。实际上，我们进行频谱分析时，只需要让我们需要信号的频率不发生频谱混叠就行了，由此就出现了带通采样定理。</p>
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            <h1 id="对Nyquist-Shannon采样定理的直观理解"><a href="#对Nyquist-Shannon采样定理的直观理解" class="headerlink" title="对Nyquist-Shannon采样定理的直观理解"></a>对Nyquist-Shannon采样定理的直观理解</h1><p>奈奎斯特(香农)采样定理是信号采样中需要遵守的重要定理，即采样频率至少为信号频率的两倍，才能还原原信号。这里给出对其原理的直观理解。</p>
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            <h1 id="频谱泄露与窗函数"><a href="#频谱泄露与窗函数" class="headerlink" title="频谱泄露与窗函数"></a>频谱泄露与窗函数</h1><p>在FFT(傅里叶变换)分析信号时，常常会提到频谱泄露现象，即某频率谱线的幅值分布到其他频段。这样会严重影响信号频率和幅度的判断，为了减轻这种现象，使用窗函数进行截取，即加窗。</p>
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            <h1 id="Typora与hexo的优雅结合-公式和图片"><a href="#Typora与hexo的优雅结合-公式和图片" class="headerlink" title="Typora与hexo的优雅结合:公式和图片"></a>Typora与hexo的优雅结合:公式和图片</h1><p>Typora是一款十分好用的Markdown编写软件，用它写文章可以大大提升工作效率。但是当我想将它用于博客编写时出现了一些问题：1，图片无法正常显示。2，latex公式无法显示。在这里我给出我的解决方法。</p>
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